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Guerrero Roman, Merce ; Rubiera García, Diego ; Saez-Chillon Gomez, Diego | Amer Physical Soc | 2020-12-16Constant roll inflation is analyzed in the presence of multiscalar fields which are assumed to be described by a constant roll rate each. The different cases are studied and the corresponding potentials are reconstructed. The exact solutions are[...]texto impreso
Einstein-Cartan theory is an extension of the standard formulation of general relativity characterized by a nonvanishing torsion. The latter is sourced by the matter fields via the spin tensor, and its effects are expected to be important at ver[...]texto impreso
Einstein-Cartan theory is an extension of the standard formulation of General Relativity where torsion (the antisymmetric part of the affine connection) is non-vanishing. Just as the space-time metric is sourced by the stress-energy tensor of th[...]texto impreso
This paper provides a short but comprehensible overview of some relevant aspects of metric-affine theories of gravity in relation to the physics and astrophysics of compact objects. We shall highlight the pertinence of this approach to supersede[...]texto impreso
Gravity can be formulated as a gauge theory by combining symmetry principles and geometrical methods in a consistent mathematical framework. The gauge approach to gravity leads directly to non-Euclidean, post-Riemannian spacetime geometries, pro[...]texto impreso
Bejarano, Cecilia ; Delhom, Adria ; Jimenez Cano, Alejandro ; Olmo, Gonzalo J. ; Rubiera García, Diego | Elsevier Science BV | 2020-03-10Projective invariance is a symmetry of the Palatini version of General Relativity which is not present in the metric formulation. The fact that the Riemann tensor changes nontrivially under projective transformations implies that, unlike in the [...]texto impreso
We work out the junction conditions forf(R) gravity formulated in metric-affine (Palatini) spaces using a tensor distributional approach. These conditions are needed for building consistent models of gravitating bodies with an interior and exter[...]texto impreso
General relativity yields an analytical prediction of a minimum required mass of roughly similar to 0.08-0.09 M-circle dot for a star to stably burn sufficient hydrogen to fully compensate photospheric losses and, therefore, to belong to the mai[...]texto impreso
We find multicenter (Majumdar-Papapetrou type) solutions of Eddington-inspired Born-Infeld gravity coupled to electromagnetic fields governed by a Born-Infeld-like Lagrangian. We construct the general solution for an arbitrary number of centers [...]texto impreso
Afonso, Victor I. ; Olmo, Gonzalo J. ; Orazi, Emanuele ; Rubiera García, Diego | IOP Publishing | 2019-12Taking advantage of a previously developed method, which allows to map solutions of General Relativity into a broad family of theories of gravity based on the Ricci tensor (Ricci-based gravities), we find new exact analytical scalar field soluti[...]texto impreso
We study static, spherically symmetric black holes supported by the Euler-Heisenberg theory of electrodynamics and coupled to two different modified theories of gravity. Such theories are the quadratic f (R) model and Eddington-inspired Born-Inf[...]texto impreso
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Martín Moruno, María del Prado ; Rubiera García, Diego ; otros, ... | Springer/plenum publishers | 2020-08-31In this paper, which is of programmatic rather than quantitative nature, we aim to further delineate and sharpen the future potential of the LISA mission in the area of fundamental physics. Given the very broad range of topics that might be rele[...]texto impreso
Guerrero Roman, Merce ; Mora Pérez, Gerardo ; Olmo, Gonzalo J. ; Orazi, Emanuele ; Rubiera García, Diego | IOP publishing ltd | 2020-07We find an exact, rotating charged black hole solution within Eddington-inspired Born-Infeld gravity. To this end we employ a recently developed correspondence or mapping between modified gravity models built as scalars out of contractions of th[...]texto impreso
The understanding of stellar structure represents the crossroads of our theories of the nuclear force and the gravitational interaction under the most extreme conditions observably accessible. It provides a powerful probe of the strong field reg[...]
